A Mathematical Orchard: Problems and Solutions by Mark I. Krusemeyer, George T. Gilbert, Loren C. Larson PDF

By Mark I. Krusemeyer, George T. Gilbert, Loren C. Larson

ISBN-10: 0883858339

ISBN-13: 9780883858332

This quantity is a republication and enlargement of the much-loved Wohascum County challenge ebook, released in 1993. the unique one hundred thirty difficulties were retained and supplemented by means of an extra seventy eight difficulties. The puzzles contained inside of, that are obtainable yet by no means regimen, were in particular chosen for his or her mathematical attraction, and distinctive suggestions are supplied. The reader will come upon puzzles concerning calculus, algebra, discrete arithmetic, geometry and quantity idea, and the quantity comprises an appendix determining the prerequisite wisdom for every challenge. A moment appendix organises the issues through material in order that readers can concentration their consciousness on specific sorts of difficulties in the event that they want. This assortment will supply entertainment for professional challenge solvers and should you desire to hone their talents.

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Extra resources for A Mathematical Orchard: Problems and Solutions

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Di r i are rational, must α be rational? (p. 329) 191. Let L1 and L2 be skew lines in space (that is, straight lines which do not lie in the same plane). How many straight lines L have the property that every point on L has the same distance to L1 as to L2 ? (p. 332) 192. We call a sequence (xn )n≥1 a superinteger if (i) each xn is a nonnegative integer less than 10n and (ii) the last n digits of xn+1 form xn . One example of such a sequence is 1, 21, 021, 1021, 21021, 021021, . , which we abbreviate by .

Let R be a commutative ring with at least one, but only finitely many, (nonzero) zero divisors. Prove that R is finite. (p. 238) 136. Consider the transformation of the plane (except for the coordinate axes) defined by sending the point (x, y) to the point (y + 1/x, x + 1/y). Suppose we apply this transformation repeatedly, starting with some specific point (x0 , y0 ), to get a sequence of points (xn , yn ). a. Show that if (x0 , y0 ) is in the first or the third quadrant, the sequence of points will tend to infinity.

Can you recover the original numbers from this information? (p. 162) 90. Suppose all the integers have been colored with the three colors red, green and blue such that each integer has exactly one of those colors. Also suppose that the sum of any two (unequal or equal) green integers is blue, the sum of any two blue integers is green, the opposite of any green integer is blue, and the opposite of any blue integer is green. Finally, suppose that 1492 is red and that 2011 is green. Describe precisely which integers are red, which integers are green, and which integers are blue.

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A Mathematical Orchard: Problems and Solutions by Mark I. Krusemeyer, George T. Gilbert, Loren C. Larson


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